set1 = set()
print("========================")
set2 = {1, 11, 22, 8, 9, 10}
print(set2)
print(type(set2))
print("========================")
set3 = {1, 11, 22, 8, 9, 10, 8, 10, 11}
print(set3)
print("========================")
set11 = {1, 2, 3, 4, 5}
set22 = {4, 5, 6, 7, 8}

print(set11 & set22)
print("========================")
print(set11 | set22)
print("========================")
print(set11 - set22)